Welcome to our community, Sonal
With Conditional Build Tags, you tag information to be
excluded at the time you create your help output. So lets say you
want an output for a US audience and one for a UK audience. You
would have all the content in a single set of source files,k then
generate two separate help systems.
If linking to an application, the application developer would
need to know which help system to link to. That all falls squarely
in the lap of the developer.
From what you asked, it would seem you believe information is
tagged and parameters are passed from the application to use the
build tags. That's not the way they work.
Cheers... Rick